Emily Thornberry has been accused of 'misreading the facts' over Israel's actions against IranCredit: Alamy Live News

LFI director Jennifer Gerber said it was “beyond belief” that the Labour frontbench had chosen to “cast Israel as the villain” at the same time as staying silent about the war crimes committed by Iran and Russia on behalf of Syrian President Assad.

In her letter to the Foreign Secretary on Thursday Ms Thornberry said Israel’s bombing of Iranian and Syrian targets last week had made the country “ever more dangerous”.

She called on Mr Hunt to threaten the regime with a arms sales ban and a suspension of joint operations between the UK and Israel if it continues to “engage in escalating acts of aggression against Iran”.

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Ms Gerber branded Ms Thornberry’s comments “absurd”.

She blasted: “It is frankly beyond belief that, having barely uttered a word about the brutal war crimes and mass killing of civilians carried out by Russia and Iran on behalf of the Assad regime, the Labour leadership has chosen to cast Israel as the villain in Syria.

“Once again, Jeremy Corbyn’s Labour party is showing its hostility to the world’s only Jewish state, its appeasement of Vladimir Putin and its failure to recognise the danger posed by the Iranian theocracy. This would be absurd were it not so appalling.”